<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区-->
    <el-card>
      <!--提示区域-->
      <el-alert title="添加商品信息" type="info" show-icon center :closable="false">
      </el-alert>
      <!--步骤条区域-->
      <el-steps :space="200" :active="parseInt(activeIndex)" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
<!--所有tabs标签页中的内容填写完毕后，才组成一个完整的form表单-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-position="top" label-width="100px">
        <!--Tabs标签页区域-->
        <el-tabs v-model="activeIndex" tab-position="left" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类">
              <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的item项-->
            <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for="(cb, index) in item.attr_vals"
                             :key="index" :label="cb" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <!--渲染表单的item项-->
            <el-form-item v-for="item in onlyTableData" :key="item.attr_id" :label="item.attr_name">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
                class="upload-demo"
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器组件-->
            <quill-editor
                ref="myQuillEditor"
                v-model="addForm.goods_introduce"/>
            <!--添加商品按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
<!--图片预览对话框-->
    <el-dialog
        title="图片预览"
        :visible.sync="previewDialogVisible"
        width="50%">
      <img :src="previewPath" alt="">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'loadsh'

export default {
  name: "Add",
  data() {
    return {
      //步骤条激活项的索引值
      activeIndex: '0',
      //添加商品的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        goods_cat: [], //级联选择框双向绑定的Id值
        pics: [],//上传的图片临时路径对象
        goods_introduce: '', //商品的详情描述
        attrs: [],
      },
      //添加商品的验证规则对象
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
      },
      //商品的分类数据
      cateList: [],
      //商品分类级联选择框的属性
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //商品动态参数列表的数据
      manyTableData: [],
      //商品静态属性列表的数据
      onlyTableData: [],
      //上传图片的URL地址
      uploadURL: 'http://106.53.73.30:8888/api/private/v1/upload',
      //图片上传headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      //预览图片的存放路径
      previewPath: '',
      //控制图片预览对话框的显示/隐藏
      previewDialogVisible: false,
    }
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品的分类数据
    async getCateList() {
      const { data :res }= await this.$http.get('categories');
      if(res.meta.status !== 200) return this.$message.error('获取商品分类数据失败');
      this.cateList = res.data;
    },
    //级联选择框一旦做出选择，则触发该函数
    handleChange() {
      if(this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    beforeTabLeave(activeName,oldActiveName) {
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择商品分类');
        return false; //阻止标签页的切换
      }
    },
    async tabClicked() {
      if(this.activeIndex === '1'){ //进入了动态商品参数的面板，因此应该立即发起商品动态参数请求
        const { data : res } = await this.$http.get(`categories/${this.cateId}/attributes`,{params : {sel : 'many'}});
        if(res.meta.status !== 200) return this.$message.error('获取商品动态参数列表失败');
        res.data.forEach(item => {
          item.attr_vals = (item.attr_vals? item.attr_vals.split(' ') : []); //数组
        })
        // console.log(res.data);
        this.manyTableData = res.data;
      }else if(this.activeIndex === '2') { //进入商品属性面板，应该立即发起商品静态属性请求
        const { data : res } = await this.$http.get(`categories/${this.cateId}/attributes`,{params : {sel : 'only'}});
        if(res.meta.status !== 200) return this.$message.error('获取商品静态属性列表失败');
        // console.log(res.data);
        this.onlyTableData = res.data;
      }
    },
    //处理图片预览事件
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      console.log(file);
      console.log(this.previewPath);
      this.previewDialogVisible = true;
    },
    //处理移除图片的操作
    handleRemove(file) { //file是将要被移除的图片
      // console.log(file);
      const filePath = file.response.data.tmp_path;
      const index = this.addForm.pics.findIndex(x => x.pic === filePath);
      this.addForm.pics.splice(index,1);
      console.log(this.addForm);
    },
    //监听图片上传成功
    handleSuccess(response) {
      //1.拼接得到一个图片信息对象
      const picInfo = { pics : response.data.tmp_path}
      //2.将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo);
      // console.log(this.addForm);
    },
    //添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return this.$message.error('请填写必要的表单项！');
        // 执行添加的业务逻辑
        // loadsh cloneDeep(obj)
        // 因为级联选择框通过v-model双向绑定addForm.goods_cat，且只要求goods_cat是数组，和我们添加商品网络请求要求的请求对象相悖
        // 于是先深拷贝addForm
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = this.addForm.goods_cat.join(',');
        //处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')};
          this.addForm.attrs.push(newInfo);
        })
        //处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals};
          this.addForm.attrs.push(newInfo);
        })
        form.attrs = this.addForm.attrs;
        // console.log(form);
        //发起添加商品的网络请求
        //商品的名称必须是唯一的
        const { data : res } = await this.$http.post('goods',form);
        if(res.meta.status !== 201) return this.$message.error('创建商品失败');
        this.$message.success('创建商品成功');
        //通过编程式导航，跳转到商品列表页面
        this.$router.push('/goods');

      })
    }

  },
  computed: {
    cateId() {
      return this.addForm.goods_cat.slice(-1);
    }
  }



}
</script>

<style lang="less" scoped>
  .el-steps {
    margin: 15px 0;
  }
  .el-step__title {
    font-size: 10px;
  }
  .el-checkbox {
    margin: 0 10px 0 0;
  }
  .btnAdd {
    margin-top: 15px;
  }


</style>
